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Subsequent Events - Additional Information (Detail) $ / shares in Units, shares in Millions, T in Millions, $ in Millions				1 Months Ended	12 Months Ended
	Feb. 18, 2016 shares	Feb. 12, 2016 $ / shares	Feb. 01, 2016 USD ($)	Feb. 29, 2016 USD ($) MBoe operation Wells T	Dec. 31, 2015 MBoe shares	Feb. 17, 2016 shares	Dec. 31, 2014 shares
Subsequent Event [Line Items]
Common units outstanding (in shares) | shares					12.2		12.2
Sales of properties (in MBoe) | MBoe					108
Subsequent Event [Member]
Subsequent Event [Line Items]
Distribution paid (in dollar per share) | $ / shares		$ 0.45
Common units outstanding (in shares) | shares	12.2					122.3
Common Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Reverse split ratio, common units	0.1
Appalachian Basin [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Proceeds from sale of royalty and overriding royalty interests				$ 36.6
Gain on sale				$ 20.3
Number of gross producing wells | Wells				765
Percent of estimated proved reserves				10.00%
Sales of properties (in MBoe) | MBoe				1,094
Texas, Georgia, Tennessee [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Proceeds from sale of royalty and overriding royalty interests			$ 9.8
Gain on sale			$ 1.6
Disposition of reserves and related royalty rights, number of operations | operation				3
Percent of proved reserves and related royalty rights sold				27.00%
Disposition of proved reserves (in tons) | T				139

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Disposition of Proved Reserves and Related Royalty Rights, Quantity

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Per unit of ownership amount of cash distributions paid to unit-holder of a limited partnership (LP).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of gain (loss) on sale or disposal of property with proven oil and gas reserves.

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The number of limited partner units outstanding.

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The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Energy measure of decrease in quantity of proved reserve of oil and gas resulting from sale of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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